Smallest unit in the plant cell wall is

Options

A. Micelle
B. Microfibril
C. Fibril
D. None of these

Answer

To answer the question "Smallest unit in the plant cell wall is," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Plant Cell Wall**: The plant cell wall is a rigid outer layer that provides structure and protection to the plant cell. It is primarily composed of cellulose, hemicellulose, and pectin.

2. **Identifying the Smallest Unit**: The smallest functional unit within the plant cell wall is known as a "micelle." Micelles are small aggregates of surfactant molecules that play a role in the structure of the cell wall.

3. **Composition of Micelles**: A micelle is made up of approximately 100 cellulose molecules. These cellulose molecules are long chains of glucose units that provide strength and rigidity to the plant cell wall.

4. **Formation of Microfibrils**: Multiple micelles come together to form a larger structure known as a microfibril. Specifically, around 20 micelles combine to create one microfibril.

5. **Further Assembly into Fibrils**: Similarly, multiple microfibrils can aggregate to form a larger structure called a fibril, with around 20 microfibrils making up one fibril.

6. **Conclusion**: Therefore, the smallest unit in the plant cell wall is a micelle.

### Final Answer:
The smallest unit in the plant cell wall is a **micelle**.

---